1 /* Top-level LTO routines.
2 Copyright 2009, 2010 Free Software Foundation, Inc.
3 Contributed by CodeSourcery, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
27 #include "diagnostic.h"
29 #include "libiberty.h"
32 #include "tree-ssa-operands.h"
33 #include "tree-pass.h"
34 #include "langhooks.h"
37 #include "pointer-set.h"
44 #include "lto-streamer.h"
46 /* This needs to be included after config.h. Otherwise, _GNU_SOURCE will not
47 be defined in time to set __USE_GNU in the system headers, and strsignal
48 will not be declared. */
53 /* Handle opening elf files on hosts, such as Windows, that may use
54 text file handling that will break binary access. */
62 DEF_VEC_ALLOC_P(bitmap,heap);
64 /* Read the constructors and inits. */
67 lto_materialize_constructors_and_inits (struct lto_file_decl_data * file_data)
70 const char *data = lto_get_section_data (file_data,
71 LTO_section_static_initializer,
73 lto_input_constructors_and_inits (file_data, data);
74 lto_free_section_data (file_data, LTO_section_static_initializer, NULL,
78 /* Read the function body for the function associated with NODE if possible. */
81 lto_materialize_function (struct cgraph_node *node)
84 struct lto_file_decl_data *file_data;
85 const char *data, *name;
89 /* Ignore clone nodes. Read the body only from the original one.
90 We may find clone nodes during LTRANS after WPA has made inlining
96 file_data = node->local.lto_file_data;
97 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
99 /* We may have renamed the declaration, e.g., a static function. */
100 name = lto_get_decl_name_mapping (file_data, name);
102 data = lto_get_section_data (file_data, LTO_section_function_body,
108 gcc_assert (!DECL_IS_BUILTIN (decl));
110 /* This function has a definition. */
111 TREE_STATIC (decl) = 1;
113 gcc_assert (DECL_STRUCT_FUNCTION (decl) == NULL);
114 allocate_struct_function (decl, false);
116 /* Load the function body only if not operating in WPA mode. In
117 WPA mode, the body of the function is not needed. */
120 lto_input_function_body (file_data, decl, data);
121 lto_stats.num_function_bodies++;
124 fn = DECL_STRUCT_FUNCTION (decl);
125 lto_free_section_data (file_data, LTO_section_function_body, name,
128 /* Look for initializers of constant variables and private
130 for (step = fn->local_decls; step; step = TREE_CHAIN (step))
132 tree decl = TREE_VALUE (step);
133 if (TREE_CODE (decl) == VAR_DECL
134 && (TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
135 && flag_unit_at_a_time)
136 varpool_finalize_decl (decl);
140 DECL_EXTERNAL (decl) = 1;
142 /* Let the middle end know about the function. */
143 rest_of_decl_compilation (decl, 1, 0);
144 if (cgraph_node (decl)->needed)
145 cgraph_mark_reachable_node (cgraph_node (decl));
149 /* Decode the content of memory pointed to by DATA in the the
150 in decl state object STATE. DATA_IN points to a data_in structure for
151 decoding. Return the address after the decoded object in the input. */
153 static const uint32_t *
154 lto_read_in_decl_state (struct data_in *data_in, const uint32_t *data,
155 struct lto_in_decl_state *state)
162 decl = lto_streamer_cache_get (data_in->reader_cache, (int) ix);
163 if (TREE_CODE (decl) != FUNCTION_DECL)
165 gcc_assert (decl == void_type_node);
168 state->fn_decl = decl;
170 for (i = 0; i < LTO_N_DECL_STREAMS; i++)
172 uint32_t size = *data++;
173 tree *decls = GGC_NEWVEC (tree, size);
175 for (j = 0; j < size; j++)
177 decls[j] = lto_streamer_cache_get (data_in->reader_cache, data[j]);
179 /* Register every type in the global type table. If the
180 type existed already, use the existing type. */
181 if (TYPE_P (decls[j]))
182 decls[j] = gimple_register_type (decls[j]);
185 state->streams[i].size = size;
186 state->streams[i].trees = decls;
194 /* Read all the symbols from buffer DATA, using descriptors in DECL_DATA.
195 RESOLUTIONS is the set of symbols picked by the linker (read from the
196 resolution file when the linker plugin is being used). */
199 lto_read_decls (struct lto_file_decl_data *decl_data, const void *data,
200 VEC(ld_plugin_symbol_resolution_t,heap) *resolutions)
202 const struct lto_decl_header *header = (const struct lto_decl_header *) data;
203 const int32_t decl_offset = sizeof (struct lto_decl_header);
204 const int32_t main_offset = decl_offset + header->decl_state_size;
205 const int32_t string_offset = main_offset + header->main_size;
206 struct lto_input_block ib_main;
207 struct data_in *data_in;
209 const uint32_t *data_ptr, *data_end;
210 uint32_t num_decl_states;
212 LTO_INIT_INPUT_BLOCK (ib_main, (const char *) data + main_offset, 0,
215 data_in = lto_data_in_create (decl_data, (const char *) data + string_offset,
216 header->string_size, resolutions);
218 /* Read the global declarations and types. */
219 while (ib_main.p < ib_main.len)
221 tree t = lto_input_tree (&ib_main, data_in);
222 gcc_assert (t && ib_main.p <= ib_main.len);
225 /* Read in lto_in_decl_state objects. */
226 data_ptr = (const uint32_t *) ((const char*) data + decl_offset);
228 (const uint32_t *) ((const char*) data_ptr + header->decl_state_size);
229 num_decl_states = *data_ptr++;
231 gcc_assert (num_decl_states > 0);
232 decl_data->global_decl_state = lto_new_in_decl_state ();
233 data_ptr = lto_read_in_decl_state (data_in, data_ptr,
234 decl_data->global_decl_state);
236 /* Read in per-function decl states and enter them in hash table. */
237 decl_data->function_decl_states =
238 htab_create_ggc (37, lto_hash_in_decl_state, lto_eq_in_decl_state, NULL);
240 for (i = 1; i < num_decl_states; i++)
242 struct lto_in_decl_state *state = lto_new_in_decl_state ();
245 data_ptr = lto_read_in_decl_state (data_in, data_ptr, state);
246 slot = htab_find_slot (decl_data->function_decl_states, state, INSERT);
247 gcc_assert (*slot == NULL);
251 if (data_ptr != data_end)
252 internal_error ("bytecode stream: garbage at the end of symbols section");
254 /* Set the current decl state to be the global state. */
255 decl_data->current_decl_state = decl_data->global_decl_state;
257 lto_data_in_delete (data_in);
260 /* strtoll is not portable. */
262 lto_parse_hex (const char *p) {
264 for (; *p != '\0'; ++p)
269 if (c >= '0' && c <= '9')
271 else if (c >= 'a' && c <= 'f')
273 else if (c >= 'A' && c <= 'F')
276 internal_error ("could not parse hex number");
282 /* Read resolution for file named FILE_NAME. The resolution is read from
283 RESOLUTION. An array with the symbol resolution is returned. The array
284 size is written to SIZE. */
286 static VEC(ld_plugin_symbol_resolution_t,heap) *
287 lto_resolution_read (FILE *resolution, lto_file *file)
289 /* We require that objects in the resolution file are in the same
290 order as the lto1 command line. */
291 unsigned int name_len;
293 unsigned int num_symbols;
295 VEC(ld_plugin_symbol_resolution_t,heap) *ret = NULL;
296 unsigned max_index = 0;
301 name_len = strlen (file->filename);
302 obj_name = XNEWVEC (char, name_len + 1);
303 fscanf (resolution, " "); /* Read white space. */
305 fread (obj_name, sizeof (char), name_len, resolution);
306 obj_name[name_len] = '\0';
307 if (strcmp (obj_name, file->filename) != 0)
308 internal_error ("unexpected file name %s in linker resolution file. "
309 "Expected %s", obj_name, file->filename);
310 if (file->offset != 0)
315 t = fscanf (resolution, "@0x%16s", offset_p);
317 internal_error ("could not parse file offset");
318 offset = lto_parse_hex (offset_p);
319 if (offset != file->offset)
320 internal_error ("unexpected offset");
325 fscanf (resolution, "%u", &num_symbols);
327 for (i = 0; i < num_symbols; i++)
332 enum ld_plugin_symbol_resolution r;
334 unsigned int lto_resolution_str_len =
335 sizeof (lto_resolution_str) / sizeof (char *);
337 t = fscanf (resolution, "%u %26s %*[^\n]\n", &index, r_str);
339 internal_error ("Invalid line in the resolution file.");
340 if (index > max_index)
343 for (j = 0; j < lto_resolution_str_len; j++)
345 if (strcmp (lto_resolution_str[j], r_str) == 0)
347 r = (enum ld_plugin_symbol_resolution) j;
351 if (j == lto_resolution_str_len)
352 internal_error ("Invalid resolution in the resolution file.");
354 VEC_safe_grow_cleared (ld_plugin_symbol_resolution_t, heap, ret,
356 VEC_replace (ld_plugin_symbol_resolution_t, ret, index, r);
362 /* Generate a TREE representation for all types and external decls
365 Read all of the globals out of the file. Then read the cgraph
366 and process the .o index into the cgraph nodes so that it can open
367 the .o file to load the functions and ipa information. */
369 static struct lto_file_decl_data *
370 lto_file_read (lto_file *file, FILE *resolution_file)
372 struct lto_file_decl_data *file_data;
375 VEC(ld_plugin_symbol_resolution_t,heap) *resolutions;
377 resolutions = lto_resolution_read (resolution_file, file);
379 file_data = GGC_NEW (struct lto_file_decl_data);
380 file_data->file_name = file->filename;
381 file_data->section_hash_table = lto_obj_build_section_table (file);
382 file_data->renaming_hash_table = lto_create_renaming_table ();
384 data = lto_get_section_data (file_data, LTO_section_decls, NULL, &len);
385 lto_read_decls (file_data, data, resolutions);
386 lto_free_section_data (file_data, LTO_section_decls, NULL, data, len);
391 #if HAVE_MMAP_FILE && HAVE_SYSCONF && defined _SC_PAGE_SIZE
392 #define LTO_MMAP_IO 1
396 /* Page size of machine is used for mmap and munmap calls. */
397 static size_t page_mask;
400 /* Get the section data of length LEN from FILENAME starting at
401 OFFSET. The data segment must be freed by the caller when the
402 caller is finished. Returns NULL if all was not well. */
405 lto_read_section_data (struct lto_file_decl_data *file_data,
406 intptr_t offset, size_t len)
410 static char *fd_name;
412 intptr_t computed_len;
413 intptr_t computed_offset;
417 /* Keep a single-entry file-descriptor cache. The last file we
418 touched will get closed at exit.
419 ??? Eventually we want to add a more sophisticated larger cache
420 or rather fix function body streaming to not stream them in
421 practically random order. */
423 && strcmp (fd_name, file_data->file_name) != 0)
431 fd_name = xstrdup (file_data->file_name);
432 fd = open (file_data->file_name, O_RDONLY|O_BINARY);
440 size_t page_size = sysconf (_SC_PAGE_SIZE);
441 page_mask = ~(page_size - 1);
444 computed_offset = offset & page_mask;
445 diff = offset - computed_offset;
446 computed_len = len + diff;
448 result = (char *) mmap (NULL, computed_len, PROT_READ, MAP_PRIVATE,
449 fd, computed_offset);
450 if (result == MAP_FAILED)
453 return result + diff;
455 result = (char *) xmalloc (len);
456 if (lseek (fd, offset, SEEK_SET) != offset
457 || read (fd, result, len) != (ssize_t) len)
468 /* Get the section data from FILE_DATA of SECTION_TYPE with NAME.
469 NAME will be NULL unless the section type is for a function
473 get_section_data (struct lto_file_decl_data *file_data,
474 enum lto_section_type section_type,
478 htab_t section_hash_table = file_data->section_hash_table;
479 struct lto_section_slot *f_slot;
480 struct lto_section_slot s_slot;
481 const char *section_name = lto_get_section_name (section_type, name);
485 s_slot.name = section_name;
486 f_slot = (struct lto_section_slot *) htab_find (section_hash_table, &s_slot);
489 data = lto_read_section_data (file_data, f_slot->start, f_slot->len);
493 free (CONST_CAST (char *, section_name));
498 /* Free the section data from FILE_DATA of SECTION_TYPE with NAME that
499 starts at OFFSET and has LEN bytes. */
502 free_section_data (struct lto_file_decl_data *file_data ATTRIBUTE_UNUSED,
503 enum lto_section_type section_type ATTRIBUTE_UNUSED,
504 const char *name ATTRIBUTE_UNUSED,
505 const char *offset, size_t len ATTRIBUTE_UNUSED)
508 intptr_t computed_len;
509 intptr_t computed_offset;
514 computed_offset = ((intptr_t) offset) & page_mask;
515 diff = (intptr_t) offset - computed_offset;
516 computed_len = len + diff;
518 munmap ((caddr_t) computed_offset, computed_len);
520 free (CONST_CAST(char *, offset));
524 /* Vector of all cgraph node sets. */
525 static GTY (()) VEC(cgraph_node_set, gc) *lto_cgraph_node_sets;
526 static GTY (()) VEC(varpool_node_set, gc) *lto_varpool_node_sets;
529 /* Group cgrah nodes by input files. This is used mainly for testing
533 lto_1_to_1_map (void)
535 struct cgraph_node *node;
536 struct varpool_node *vnode;
537 struct lto_file_decl_data *file_data;
538 struct pointer_map_t *pmap;
539 struct pointer_map_t *vpmap;
541 varpool_node_set vset;
544 timevar_push (TV_WHOPR_WPA);
546 lto_cgraph_node_sets = VEC_alloc (cgraph_node_set, gc, 1);
547 lto_varpool_node_sets = VEC_alloc (varpool_node_set, gc, 1);
549 pmap = pointer_map_create ();
550 vpmap = pointer_map_create ();
552 for (node = cgraph_nodes; node; node = node->next)
554 /* We will get proper partition based on function they are inlined to or
556 if (node->global.inlined_to || node->clone_of)
558 /* Nodes without a body do not need partitioning. */
559 if (!node->analyzed || node->same_body_alias)
561 /* We only need to partition the nodes that we read from the
562 gimple bytecode files. */
563 file_data = node->local.lto_file_data;
564 if (file_data == NULL)
567 slot = pointer_map_contains (pmap, file_data);
569 set = (cgraph_node_set) *slot;
572 set = cgraph_node_set_new ();
573 slot = pointer_map_insert (pmap, file_data);
575 VEC_safe_push (cgraph_node_set, gc, lto_cgraph_node_sets, set);
576 vset = varpool_node_set_new ();
577 slot = pointer_map_insert (vpmap, file_data);
579 VEC_safe_push (varpool_node_set, gc, lto_varpool_node_sets, vset);
582 cgraph_node_set_add (set, node);
585 for (vnode = varpool_nodes; vnode; vnode = vnode->next)
587 if (vnode->alias || !vnode->needed)
589 slot = pointer_map_contains (vpmap, file_data);
591 vset = (varpool_node_set) *slot;
594 set = cgraph_node_set_new ();
595 slot = pointer_map_insert (pmap, file_data);
597 VEC_safe_push (cgraph_node_set, gc, lto_cgraph_node_sets, set);
598 vset = varpool_node_set_new ();
599 slot = pointer_map_insert (vpmap, file_data);
601 VEC_safe_push (varpool_node_set, gc, lto_varpool_node_sets, vset);
604 varpool_node_set_add (vset, vnode);
607 /* If the cgraph is empty, create one cgraph node set so that there is still
608 an output file for any variables that need to be exported in a DSO. */
609 if (!lto_cgraph_node_sets)
611 set = cgraph_node_set_new ();
612 VEC_safe_push (cgraph_node_set, gc, lto_cgraph_node_sets, set);
613 vset = varpool_node_set_new ();
614 VEC_safe_push (varpool_node_set, gc, lto_varpool_node_sets, vset);
617 pointer_map_destroy (pmap);
618 pointer_map_destroy (vpmap);
620 timevar_pop (TV_WHOPR_WPA);
622 lto_stats.num_cgraph_partitions += VEC_length (cgraph_node_set,
623 lto_cgraph_node_sets);
627 /* Add inlined clone NODE and its master clone to SET, if NODE itself has
628 inlined callees, recursively add the callees. */
631 lto_add_inline_clones (cgraph_node_set set, struct cgraph_node *node,
632 bitmap original_decls)
634 struct cgraph_node *callee;
635 struct cgraph_edge *edge;
637 cgraph_node_set_add (set, node);
639 /* Check to see if NODE has any inlined callee. */
640 for (edge = node->callees; edge != NULL; edge = edge->next_callee)
642 callee = edge->callee;
643 if (callee->global.inlined_to != NULL)
644 lto_add_inline_clones (set, callee, original_decls);
648 /* Compute the transitive closure of inlining of SET based on the
649 information in the callgraph. Returns a bitmap of decls that have
650 been inlined into SET indexed by UID. */
653 lto_add_all_inlinees (cgraph_node_set set)
655 cgraph_node_set_iterator csi;
656 struct cgraph_node *node;
657 bitmap original_nodes = lto_bitmap_alloc ();
658 bitmap original_decls = lto_bitmap_alloc ();
661 /* We are going to iterate SET while adding to it, mark all original
662 nodes so that we only add node inlined to original nodes. */
663 for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))
665 bitmap_set_bit (original_nodes, csi_node (csi)->uid);
666 bitmap_set_bit (original_decls, DECL_UID (csi_node (csi)->decl));
669 /* Some of the original nodes might not be needed anymore.
674 for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))
676 struct cgraph_node *inlined_to;
677 node = csi_node (csi);
679 /* NODE was not inlined. We still need it. */
680 if (!node->global.inlined_to)
683 inlined_to = node->global.inlined_to;
685 /* NODE should have only one caller. */
686 gcc_assert (!node->callers->next_caller);
688 if (!bitmap_bit_p (original_nodes, inlined_to->uid))
690 bitmap_clear_bit (original_nodes, node->uid);
691 cgraph_node_set_remove (set, node);
698 /* Transitively add to SET all the inline clones for every node that
700 for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))
702 node = csi_node (csi);
703 if (bitmap_bit_p (original_nodes, node->uid))
704 lto_add_inline_clones (set, node, original_decls);
707 lto_bitmap_free (original_nodes);
708 lto_bitmap_free (original_decls);
711 /* Find out all static decls that need to be promoted to global because
712 of cross file sharing. This function must be run in the WPA mode after
713 all inlinees are added. */
716 lto_promote_cross_file_statics (void)
718 struct varpool_node *vnode;
721 varpool_node_set vset;
722 cgraph_node_set_iterator csi;
723 varpool_node_set_iterator vsi;
725 gcc_assert (flag_wpa);
727 n_sets = VEC_length (cgraph_node_set, lto_cgraph_node_sets);
728 for (i = 0; i < n_sets; i++)
730 set = VEC_index (cgraph_node_set, lto_cgraph_node_sets, i);
731 vset = VEC_index (varpool_node_set, lto_varpool_node_sets, i);
733 /* If node has either address taken (and we have no clue from where)
734 or it is called from other partition, it needs to be globalized. */
735 for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))
737 struct cgraph_node *node = csi_node (csi);
738 bool globalize = node->local.vtable_method;
739 struct cgraph_edge *e;
740 if (node->local.externally_visible)
743 && referenced_from_other_partition_p (&node->ref_list, set, vset))
745 for (e = node->callers; e && !globalize; e = e->next_caller)
747 struct cgraph_node *caller = e->caller;
748 if (caller->global.inlined_to)
749 caller = caller->global.inlined_to;
750 if (!cgraph_node_in_set_p (caller, set))
755 gcc_assert (flag_wpa);
756 TREE_PUBLIC (node->decl) = 1;
757 DECL_VISIBILITY (node->decl) = VISIBILITY_HIDDEN;
760 struct cgraph_node *alias;
761 for (alias = node->same_body;
762 alias; alias = alias->next)
764 TREE_PUBLIC (alias->decl) = 1;
765 DECL_VISIBILITY (alias->decl) = VISIBILITY_HIDDEN;
770 for (vsi = vsi_start (vset); !vsi_end_p (vsi); vsi_next (&vsi))
772 vnode = vsi_node (vsi);
773 /* Constant pool references use internal labels and thus can not
774 be made global. It is sensible to keep those ltrans local to
775 allow better optimization. */
776 if (!DECL_IN_CONSTANT_POOL (vnode->decl)
777 && !vnode->externally_visible && vnode->analyzed
778 && referenced_from_other_partition_p (&vnode->ref_list, set, vset))
780 gcc_assert (flag_wpa);
781 TREE_PUBLIC (vnode->decl) = 1;
782 DECL_VISIBILITY (vnode->decl) = VISIBILITY_HIDDEN;
790 /* Given a file name FNAME, return a string with FNAME prefixed with '*'. */
793 prefix_name_with_star (const char *fname)
798 len = strlen (fname) + 1 + 1;
799 star_fname = XNEWVEC (char, len);
800 snprintf (star_fname, len, "*%s", fname);
806 /* Return a copy of FNAME without the .o extension. */
809 strip_extension (const char *fname)
811 char *s = XNEWVEC (char, strlen (fname) - 2 + 1);
812 gcc_assert (strstr (fname, ".o"));
813 snprintf (s, strlen (fname) - 2 + 1, "%s", fname);
819 /* Return a file name associated with cgraph node set SET. This may
820 be a new temporary file name if SET needs to be processed by
821 LTRANS, or the original file name if all the nodes in SET belong to
822 the same input file. */
825 get_filename_for_set (cgraph_node_set set)
828 static const size_t max_fname_len = 100;
830 /* Create a new temporary file to store SET. To facilitate
831 debugging, use file names from SET as part of the new
832 temporary file name. */
833 cgraph_node_set_iterator si;
834 struct pointer_set_t *pset = pointer_set_create ();
835 for (si = csi_start (set); !csi_end_p (si); csi_next (&si))
837 struct cgraph_node *n = csi_node (si);
838 const char *node_fname;
841 /* Don't use the same file name more than once. */
842 if (pointer_set_insert (pset, n->local.lto_file_data))
845 /* The first file name found in SET determines the output
846 directory. For the remaining files, we use their
848 node_fname = n->local.lto_file_data->file_name;
851 fname = strip_extension (node_fname);
855 f = strip_extension (lbasename (node_fname));
857 /* If the new name causes an excessively long file name,
858 make the last component "___" to indicate overflow. */
859 if (strlen (fname) + strlen (f) > max_fname_len - 3)
861 fname = reconcat (fname, fname, "___", NULL);
866 fname = reconcat (fname, fname, "_", f, NULL);
871 pointer_set_destroy (pset);
875 /* Since SET does not need to be processed by LTRANS, use
876 the original file name and mark it with a '*' prefix so that
877 lto_execute_ltrans knows not to process it. */
878 cgraph_node_set_iterator si = csi_start (set);
879 struct cgraph_node *first = csi_node (si);
880 fname = prefix_name_with_star (first->local.lto_file_data->file_name);
884 /* Add the extension .wpa.o to indicate that this file has been
886 fname = reconcat (fname, fname, ".wpa.o", NULL);
893 static lto_file *current_lto_file;
896 /* Write all output files in WPA mode. Returns a NULL-terminated array of
897 output file names. */
900 lto_wpa_write_files (void)
903 unsigned i, n_sets, last_out_file_ix, num_out_files;
906 varpool_node_set vset;
908 timevar_push (TV_WHOPR_WPA);
910 /* Include all inlined functions and determine what sets need to be
911 compiled by LTRANS. After this loop, only those sets that
912 contain callgraph nodes from more than one file will need to be
913 compiled by LTRANS. */
914 for (i = 0; VEC_iterate (cgraph_node_set, lto_cgraph_node_sets, i, set); i++)
916 lto_add_all_inlinees (set);
917 lto_stats.num_output_cgraph_nodes += VEC_length (cgraph_node_ptr,
921 /* After adding all inlinees, find out statics that need to be promoted
922 to globals because of cross-file inlining. */
923 lto_promote_cross_file_statics ();
925 timevar_pop (TV_WHOPR_WPA);
927 timevar_push (TV_WHOPR_WPA_IO);
929 /* The number of output files depends on the number of input files
930 and how many callgraph node sets we create. Reserve enough space
931 for the maximum of these two. */
932 num_out_files = MAX (VEC_length (cgraph_node_set, lto_cgraph_node_sets),
934 output_files = XNEWVEC (char *, num_out_files + 1);
936 n_sets = VEC_length (cgraph_node_set, lto_cgraph_node_sets);
937 for (i = 0; i < n_sets; i++)
941 set = VEC_index (cgraph_node_set, lto_cgraph_node_sets, i);
942 vset = VEC_index (varpool_node_set, lto_varpool_node_sets, i);
943 temp_filename = get_filename_for_set (set);
944 output_files[i] = temp_filename;
946 if (cgraph_node_set_nonempty_p (set) || varpool_node_set_nonempty_p (vset))
948 /* Write all the nodes in SET to TEMP_FILENAME. */
949 file = lto_obj_file_open (temp_filename, true);
951 fatal_error ("lto_obj_file_open() failed");
954 fprintf (stderr, " %s", temp_filename);
956 lto_set_current_out_file (file);
958 ipa_write_optimization_summaries (set, vset);
960 lto_set_current_out_file (NULL);
961 lto_obj_file_close (file);
965 last_out_file_ix = n_sets;
967 lto_stats.num_output_files += n_sets;
969 output_files[last_out_file_ix] = NULL;
971 timevar_pop (TV_WHOPR_WPA_IO);
976 /* Template of LTRANS dumpbase suffix. */
977 #define DUMPBASE_SUFFIX ".ltrans18446744073709551615"
979 /* Perform local transformations (LTRANS) on the files in the NULL-terminated
980 FILES array. These should have been written previously by
981 lto_wpa_write_files (). Transformations are performed via executing
982 COLLECT_GCC for reach file. */
985 lto_execute_ltrans (char *const *files)
988 const char *collect_gcc_options, *collect_gcc;
989 struct obstack env_obstack;
991 const char **argv_ptr;
996 FILE *ltrans_output_list_stream = NULL;
997 bool seen_dumpbase = false;
998 char *dumpbase_suffix = NULL;
1000 timevar_push (TV_WHOPR_WPA_LTRANS_EXEC);
1002 /* Get the driver and options. */
1003 collect_gcc = getenv ("COLLECT_GCC");
1005 fatal_error ("environment variable COLLECT_GCC must be set");
1007 /* Set the CFLAGS environment variable. */
1008 collect_gcc_options = getenv ("COLLECT_GCC_OPTIONS");
1009 if (!collect_gcc_options)
1010 fatal_error ("environment variable COLLECT_GCC_OPTIONS must be set");
1012 /* Count arguments. */
1014 for (j = 0; collect_gcc_options[j] != '\0'; ++j)
1015 if (collect_gcc_options[j] == '\'')
1019 fatal_error ("malformed COLLECT_GCC_OPTIONS");
1021 /* Initalize the arguments for the LTRANS driver. */
1022 argv = XNEWVEC (const char *, 8 + i / 2);
1024 *argv_ptr++ = collect_gcc;
1025 *argv_ptr++ = "-xlto";
1026 for (j = 0; collect_gcc_options[j] != '\0'; ++j)
1027 if (collect_gcc_options[j] == '\'')
1033 while (collect_gcc_options[j] != '\'')
1035 obstack_init (&env_obstack);
1036 obstack_grow (&env_obstack, &collect_gcc_options[i], j - i);
1038 obstack_grow (&env_obstack, DUMPBASE_SUFFIX,
1039 sizeof (DUMPBASE_SUFFIX));
1041 obstack_1grow (&env_obstack, 0);
1042 option = XOBFINISH (&env_obstack, char *);
1045 dumpbase_suffix = option + 7 + j - i;
1046 seen_dumpbase = false;
1049 /* LTRANS does not need -fwpa nor -fltrans-*. */
1050 if (strncmp (option, "-fwpa", 5) != 0
1051 && strncmp (option, "-fltrans-", 9) != 0)
1053 if (strncmp (option, "-dumpbase", 9) == 0)
1054 seen_dumpbase = true;
1055 *argv_ptr++ = option;
1058 *argv_ptr++ = "-fltrans";
1060 /* Open the LTRANS output list. */
1061 if (ltrans_output_list)
1063 ltrans_output_list_stream = fopen (ltrans_output_list, "w");
1064 if (ltrans_output_list_stream == NULL)
1065 error ("opening LTRANS output list %s: %m", ltrans_output_list);
1068 for (i = 0; files[i]; ++i)
1072 /* If the file is prefixed with a '*', it means that we do not
1073 need to re-compile it with LTRANS because it has not been
1074 modified by WPA. Skip it from the command line to
1075 lto_execute_ltrans, but add it to ltrans_output_list_stream
1076 so it is linked after we are done. */
1077 if (files[i][0] == '*')
1079 size_t len = strlen (files[i]) - 1;
1080 if (ltrans_output_list_stream)
1081 if (fwrite (&files[i][1], 1, len, ltrans_output_list_stream) < len
1082 || fwrite ("\n", 1, 1, ltrans_output_list_stream) < 1)
1083 error ("writing to LTRANS output list %s: %m",
1084 ltrans_output_list);
1090 /* Otherwise, add FILES[I] to lto_execute_ltrans command line
1091 and add the resulting file to LTRANS output list. */
1093 /* Replace the .o suffix with a .ltrans.o suffix and write
1094 the resulting name to the LTRANS output list. */
1095 obstack_init (&env_obstack);
1096 obstack_grow (&env_obstack, files[i], strlen (files[i]) - 2);
1097 obstack_grow (&env_obstack, ".ltrans.o", sizeof (".ltrans.o"));
1098 output_name = XOBFINISH (&env_obstack, char *);
1099 if (ltrans_output_list_stream)
1101 len = strlen (output_name);
1103 if (fwrite (output_name, 1, len, ltrans_output_list_stream) < len
1104 || fwrite ("\n", 1, 1, ltrans_output_list_stream) < 1)
1105 error ("writing to LTRANS output list %s: %m",
1106 ltrans_output_list);
1110 argv_ptr[1] = output_name;
1111 argv_ptr[2] = files[i];
1114 /* Append a sequence number to -dumpbase for LTRANS. */
1115 if (dumpbase_suffix)
1116 snprintf (dumpbase_suffix, sizeof (DUMPBASE_SUFFIX) - 7,
1117 "%lu", (unsigned long) i);
1119 /* Execute the driver. */
1120 pex = pex_init (0, "lto1", NULL);
1122 fatal_error ("pex_init failed: %s", xstrerror (errno));
1124 errmsg = pex_run (pex, PEX_LAST | PEX_SEARCH, argv[0],
1125 CONST_CAST (char **, argv), NULL, NULL, &err);
1127 fatal_error ("%s: %s", errmsg, xstrerror (err));
1129 if (!pex_get_status (pex, 1, &status))
1130 fatal_error ("can't get program status: %s", xstrerror (errno));
1134 if (WIFSIGNALED (status))
1136 int sig = WTERMSIG (status);
1137 fatal_error ("%s terminated with signal %d [%s]%s",
1138 argv[0], sig, strsignal (sig),
1139 WCOREDUMP (status) ? ", core dumped" : "");
1142 fatal_error ("%s terminated with status %d", argv[0], status);
1149 /* Close the LTRANS output list. */
1150 if (ltrans_output_list_stream && fclose (ltrans_output_list_stream))
1151 error ("closing LTRANS output list %s: %m", ltrans_output_list);
1153 obstack_free (&env_obstack, NULL);
1156 timevar_pop (TV_WHOPR_WPA_LTRANS_EXEC);
1161 struct pointer_set_t *seen;
1164 #define LTO_FIXUP_SUBTREE(t) \
1166 walk_tree (&(t), lto_fixup_tree, data, NULL); \
1169 #define LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE(t) \
1173 (t) = gimple_register_type (t); \
1174 walk_tree (&(t), lto_fixup_tree, data, NULL); \
1178 static tree lto_fixup_tree (tree *, int *, void *);
1180 /* Return true if T does not need to be fixed up recursively. */
1186 || CONSTANT_CLASS_P (t)
1187 || TREE_CODE (t) == IDENTIFIER_NODE);
1190 /* Fix up fields of a tree_common T. DATA points to fix-up states. */
1193 lto_fixup_common (tree t, void *data)
1195 /* The following re-creates the TYPE_REFERENCE_TO and TYPE_POINTER_TO
1196 lists. We do not stream TYPE_REFERENCE_TO, TYPE_POINTER_TO or
1197 TYPE_NEXT_PTR_TO and TYPE_NEXT_REF_TO.
1198 First remove us from any pointer list we are on. */
1199 if (TREE_CODE (t) == POINTER_TYPE)
1201 if (TYPE_POINTER_TO (TREE_TYPE (t)) == t)
1202 TYPE_POINTER_TO (TREE_TYPE (t)) = TYPE_NEXT_PTR_TO (t);
1205 tree tem = TYPE_POINTER_TO (TREE_TYPE (t));
1206 while (tem && TYPE_NEXT_PTR_TO (tem) != t)
1207 tem = TYPE_NEXT_PTR_TO (tem);
1209 TYPE_NEXT_PTR_TO (tem) = TYPE_NEXT_PTR_TO (t);
1211 TYPE_NEXT_PTR_TO (t) = NULL_TREE;
1213 else if (TREE_CODE (t) == REFERENCE_TYPE)
1215 if (TYPE_REFERENCE_TO (TREE_TYPE (t)) == t)
1216 TYPE_REFERENCE_TO (TREE_TYPE (t)) = TYPE_NEXT_REF_TO (t);
1219 tree tem = TYPE_REFERENCE_TO (TREE_TYPE (t));
1220 while (tem && TYPE_NEXT_REF_TO (tem) != t)
1221 tem = TYPE_NEXT_REF_TO (tem);
1223 TYPE_NEXT_REF_TO (tem) = TYPE_NEXT_REF_TO (t);
1225 TYPE_NEXT_REF_TO (t) = NULL_TREE;
1228 /* Fixup our type. */
1229 LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE (TREE_TYPE (t));
1231 /* Second put us on the list of pointers of the new pointed-to type
1232 if we are a main variant. This is done in lto_fixup_type after
1233 fixing up our main variant. */
1235 /* This is not very efficient because we cannot do tail-recursion with
1236 a long chain of trees. */
1237 LTO_FIXUP_SUBTREE (TREE_CHAIN (t));
1240 /* Fix up fields of a decl_minimal T. DATA points to fix-up states. */
1243 lto_fixup_decl_minimal (tree t, void *data)
1245 lto_fixup_common (t, data);
1246 LTO_FIXUP_SUBTREE (DECL_NAME (t));
1247 LTO_FIXUP_SUBTREE (DECL_CONTEXT (t));
1250 /* Fix up fields of a decl_common T. DATA points to fix-up states. */
1253 lto_fixup_decl_common (tree t, void *data)
1255 lto_fixup_decl_minimal (t, data);
1256 LTO_FIXUP_SUBTREE (DECL_SIZE (t));
1257 LTO_FIXUP_SUBTREE (DECL_SIZE_UNIT (t));
1258 LTO_FIXUP_SUBTREE (DECL_INITIAL (t));
1259 LTO_FIXUP_SUBTREE (DECL_ATTRIBUTES (t));
1260 LTO_FIXUP_SUBTREE (DECL_ABSTRACT_ORIGIN (t));
1263 /* Fix up fields of a decl_with_vis T. DATA points to fix-up states. */
1266 lto_fixup_decl_with_vis (tree t, void *data)
1268 lto_fixup_decl_common (t, data);
1270 /* Accessor macro has side-effects, use field-name here. */
1271 LTO_FIXUP_SUBTREE (t->decl_with_vis.assembler_name);
1273 gcc_assert (no_fixup_p (DECL_SECTION_NAME (t)));
1276 /* Fix up fields of a decl_non_common T. DATA points to fix-up states. */
1279 lto_fixup_decl_non_common (tree t, void *data)
1281 lto_fixup_decl_with_vis (t, data);
1282 LTO_FIXUP_SUBTREE (DECL_ARGUMENT_FLD (t));
1283 LTO_FIXUP_SUBTREE (DECL_RESULT_FLD (t));
1284 LTO_FIXUP_SUBTREE (DECL_VINDEX (t));
1286 /* SAVED_TREE should not cleared by now. Also no accessor for base type. */
1287 gcc_assert (no_fixup_p (t->decl_non_common.saved_tree));
1290 /* Fix up fields of a decl_non_common T. DATA points to fix-up states. */
1293 lto_fixup_function (tree t, void *data)
1295 lto_fixup_decl_non_common (t, data);
1296 LTO_FIXUP_SUBTREE (DECL_FUNCTION_PERSONALITY (t));
1299 /* Fix up fields of a field_decl T. DATA points to fix-up states. */
1302 lto_fixup_field_decl (tree t, void *data)
1304 lto_fixup_decl_common (t, data);
1305 LTO_FIXUP_SUBTREE (DECL_FIELD_OFFSET (t));
1306 LTO_FIXUP_SUBTREE (DECL_BIT_FIELD_TYPE (t));
1307 LTO_FIXUP_SUBTREE (DECL_QUALIFIER (t));
1308 gcc_assert (no_fixup_p (DECL_FIELD_BIT_OFFSET (t)));
1309 LTO_FIXUP_SUBTREE (DECL_FCONTEXT (t));
1312 /* Fix up fields of a type T. DATA points to fix-up states. */
1315 lto_fixup_type (tree t, void *data)
1319 lto_fixup_common (t, data);
1320 LTO_FIXUP_SUBTREE (TYPE_CACHED_VALUES (t));
1321 LTO_FIXUP_SUBTREE (TYPE_SIZE (t));
1322 LTO_FIXUP_SUBTREE (TYPE_SIZE_UNIT (t));
1323 LTO_FIXUP_SUBTREE (TYPE_ATTRIBUTES (t));
1324 LTO_FIXUP_SUBTREE (TYPE_NAME (t));
1326 /* Accessors are for derived node types only. */
1327 if (!POINTER_TYPE_P (t))
1328 LTO_FIXUP_SUBTREE (t->type.minval);
1329 LTO_FIXUP_SUBTREE (t->type.maxval);
1331 /* Accessor is for derived node types only. */
1332 LTO_FIXUP_SUBTREE (t->type.binfo);
1334 if (TYPE_CONTEXT (t))
1336 if (TYPE_P (TYPE_CONTEXT (t)))
1337 LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE (TYPE_CONTEXT (t));
1339 LTO_FIXUP_SUBTREE (TYPE_CONTEXT (t));
1341 LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE (TYPE_CANONICAL (t));
1343 /* The following re-creates proper variant lists while fixing up
1344 the variant leaders. We do not stream TYPE_NEXT_VARIANT so the
1345 variant list state before fixup is broken. */
1347 /* Remove us from our main variant list if we are not the variant leader. */
1348 if (TYPE_MAIN_VARIANT (t) != t)
1350 tem = TYPE_MAIN_VARIANT (t);
1351 while (tem && TYPE_NEXT_VARIANT (tem) != t)
1352 tem = TYPE_NEXT_VARIANT (tem);
1354 TYPE_NEXT_VARIANT (tem) = TYPE_NEXT_VARIANT (t);
1355 TYPE_NEXT_VARIANT (t) = NULL_TREE;
1358 /* Query our new main variant. */
1359 mv = gimple_register_type (TYPE_MAIN_VARIANT (t));
1361 /* If we were the variant leader and we get replaced ourselves drop
1362 all variants from our list. */
1363 if (TYPE_MAIN_VARIANT (t) == t
1369 tree tem2 = TYPE_NEXT_VARIANT (tem);
1370 TYPE_NEXT_VARIANT (tem) = NULL_TREE;
1375 /* If we are not our own variant leader link us into our new leaders
1379 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (mv);
1380 TYPE_NEXT_VARIANT (mv) = t;
1383 /* Finally adjust our main variant and fix it up. */
1384 TYPE_MAIN_VARIANT (t) = mv;
1385 LTO_FIXUP_SUBTREE (TYPE_MAIN_VARIANT (t));
1387 /* As the second step of reconstructing the pointer chains put us
1388 on the list of pointers of the new pointed-to type
1389 if we are a main variant. See lto_fixup_common for the first step. */
1390 if (TREE_CODE (t) == POINTER_TYPE
1391 && TYPE_MAIN_VARIANT (t) == t)
1393 TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (TREE_TYPE (t));
1394 TYPE_POINTER_TO (TREE_TYPE (t)) = t;
1396 else if (TREE_CODE (t) == REFERENCE_TYPE
1397 && TYPE_MAIN_VARIANT (t) == t)
1399 TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (TREE_TYPE (t));
1400 TYPE_REFERENCE_TO (TREE_TYPE (t)) = t;
1404 /* Fix up fields of a BINFO T. DATA points to fix-up states. */
1407 lto_fixup_binfo (tree t, void *data)
1409 unsigned HOST_WIDE_INT i, n;
1410 tree base, saved_base;
1412 lto_fixup_common (t, data);
1413 gcc_assert (no_fixup_p (BINFO_OFFSET (t)));
1414 LTO_FIXUP_SUBTREE (BINFO_VTABLE (t));
1415 LTO_FIXUP_SUBTREE (BINFO_VIRTUALS (t));
1416 LTO_FIXUP_SUBTREE (BINFO_VPTR_FIELD (t));
1417 n = VEC_length (tree, BINFO_BASE_ACCESSES (t));
1418 for (i = 0; i < n; i++)
1420 saved_base = base = BINFO_BASE_ACCESS (t, i);
1421 LTO_FIXUP_SUBTREE (base);
1422 if (base != saved_base)
1423 VEC_replace (tree, BINFO_BASE_ACCESSES (t), i, base);
1425 LTO_FIXUP_SUBTREE (BINFO_INHERITANCE_CHAIN (t));
1426 LTO_FIXUP_SUBTREE (BINFO_SUBVTT_INDEX (t));
1427 LTO_FIXUP_SUBTREE (BINFO_VPTR_INDEX (t));
1428 n = BINFO_N_BASE_BINFOS (t);
1429 for (i = 0; i < n; i++)
1431 saved_base = base = BINFO_BASE_BINFO (t, i);
1432 LTO_FIXUP_SUBTREE (base);
1433 if (base != saved_base)
1434 VEC_replace (tree, BINFO_BASE_BINFOS (t), i, base);
1438 /* Fix up fields of a CONSTRUCTOR T. DATA points to fix-up states. */
1441 lto_fixup_constructor (tree t, void *data)
1443 unsigned HOST_WIDE_INT idx;
1444 constructor_elt *ce;
1446 LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE (TREE_TYPE (t));
1449 VEC_iterate(constructor_elt, CONSTRUCTOR_ELTS (t), idx, ce);
1452 LTO_FIXUP_SUBTREE (ce->index);
1453 LTO_FIXUP_SUBTREE (ce->value);
1457 /* A walk_tree callback used by lto_fixup_state. TP is the pointer to the
1458 current tree. WALK_SUBTREES indicates if the subtrees will be walked.
1459 DATA is a pointer set to record visited nodes. */
1462 lto_fixup_tree (tree *tp, int *walk_subtrees, void *data)
1465 lto_fixup_data_t *fixup_data = (lto_fixup_data_t *) data;
1470 if (!t || pointer_set_contains (fixup_data->seen, t))
1473 if (TREE_CODE (t) == VAR_DECL || TREE_CODE (t) == FUNCTION_DECL)
1475 prevailing = lto_symtab_prevailing_decl (t);
1477 if (t != prevailing)
1479 /* Also replace t with prevailing defintion. We don't want to
1480 insert the other defintion in the seen set as we want to
1481 replace all instances of it. */
1486 else if (TYPE_P (t))
1488 /* Replace t with the prevailing type. We don't want to insert the
1489 other type in the seen set as we want to replace all instances of it. */
1490 t = gimple_register_type (t);
1494 if (pointer_set_insert (fixup_data->seen, t))
1497 /* walk_tree does not visit all reachable nodes that need to be fixed up.
1498 Hence we do special processing here for those kind of nodes. */
1499 switch (TREE_CODE (t))
1502 lto_fixup_field_decl (t, data);
1510 lto_fixup_decl_common (t, data);
1514 lto_fixup_decl_with_vis (t, data);
1518 lto_fixup_decl_non_common (t, data);
1522 lto_fixup_function (t, data);
1526 lto_fixup_binfo (t, data);
1531 lto_fixup_type (t, data);
1532 else if (TREE_CODE (t) == CONSTRUCTOR)
1533 lto_fixup_constructor (t, data);
1534 else if (CONSTANT_CLASS_P (t))
1535 LTO_REGISTER_TYPE_AND_FIXUP_SUBTREE (TREE_TYPE (t));
1536 else if (EXPR_P (t))
1538 /* walk_tree only handles TREE_OPERANDs. Do the rest here. */
1539 lto_fixup_common (t, data);
1540 LTO_FIXUP_SUBTREE (t->exp.block);
1545 /* Let walk_tree handle sub-trees. */
1553 /* Helper function of lto_fixup_decls. Walks the var and fn streams in STATE,
1554 replaces var and function decls with the corresponding prevailing def and
1555 records the old decl in the free-list in DATA. We also record visted nodes
1556 in the seen-set in DATA to avoid multiple visit for nodes that need not
1560 lto_fixup_state (struct lto_in_decl_state *state, lto_fixup_data_t *data)
1563 struct lto_tree_ref_table *table;
1565 /* Although we only want to replace FUNCTION_DECLs and VAR_DECLs,
1566 we still need to walk from all DECLs to find the reachable
1567 FUNCTION_DECLs and VAR_DECLs. */
1568 for (si = 0; si < LTO_N_DECL_STREAMS; si++)
1570 table = &state->streams[si];
1571 for (i = 0; i < table->size; i++)
1572 walk_tree (table->trees + i, lto_fixup_tree, data, NULL);
1576 /* A callback of htab_traverse. Just extract a state from SLOT and the
1577 lto_fixup_data_t object from AUX and calls lto_fixup_state. */
1580 lto_fixup_state_aux (void **slot, void *aux)
1582 struct lto_in_decl_state *state = (struct lto_in_decl_state *) *slot;
1583 lto_fixup_state (state, (lto_fixup_data_t *) aux);
1587 /* Fix the decls from all FILES. Replaces each decl with the corresponding
1591 lto_fixup_decls (struct lto_file_decl_data **files)
1595 struct pointer_set_t *seen = pointer_set_create ();
1596 lto_fixup_data_t data;
1599 for (i = 0; files[i]; i++)
1601 struct lto_file_decl_data *file = files[i];
1602 struct lto_in_decl_state *state = file->global_decl_state;
1603 lto_fixup_state (state, &data);
1605 htab_traverse (file->function_decl_states, lto_fixup_state_aux, &data);
1608 for (i = 0; VEC_iterate (tree, lto_global_var_decls, i, decl); i++)
1610 tree saved_decl = decl;
1611 walk_tree (&decl, lto_fixup_tree, &data, NULL);
1612 if (decl != saved_decl)
1613 VEC_replace (tree, lto_global_var_decls, i, decl);
1616 pointer_set_destroy (seen);
1619 /* Unlink a temporary LTRANS file unless requested otherwise. */
1622 lto_maybe_unlink (const char *file)
1624 if (!getenv ("WPA_SAVE_LTRANS"))
1626 if (unlink_if_ordinary (file))
1627 error ("deleting LTRANS input file %s: %m", file);
1630 fprintf (stderr, "[Leaving LTRANS input file %s]\n", file);
1633 /* Read the options saved from each file in the command line. Called
1634 from lang_hooks.post_options which is called by process_options
1635 right before all the options are used to initialize the compiler.
1636 This assumes that decode_options has already run, so the
1637 num_in_fnames and in_fnames are properly set.
1639 Note that this assumes that all the files had been compiled with
1640 the same options, which is not a good assumption. In general,
1641 options ought to be read from all the files in the set and merged.
1642 However, it is still unclear what the merge rules should be. */
1645 lto_read_all_file_options (void)
1649 /* Clear any file options currently saved. */
1650 lto_clear_file_options ();
1652 /* Set the hooks to read ELF sections. */
1653 lto_set_in_hooks (NULL, get_section_data, free_section_data);
1655 for (i = 0; i < num_in_fnames; i++)
1657 struct lto_file_decl_data *file_data;
1658 lto_file *file = lto_obj_file_open (in_fnames[i], false);
1662 file_data = XCNEW (struct lto_file_decl_data);
1663 file_data->file_name = file->filename;
1664 file_data->section_hash_table = lto_obj_build_section_table (file);
1666 lto_read_file_options (file_data);
1668 lto_obj_file_close (file);
1669 htab_delete (file_data->section_hash_table);
1673 /* Apply globally the options read from all the files. */
1674 lto_reissue_options ();
1677 static GTY((length ("lto_stats.num_input_files + 1"))) struct lto_file_decl_data **all_file_decl_data;
1679 /* Read all the symbols from the input files FNAMES. NFILES is the
1680 number of files requested in the command line. Instantiate a
1681 global call graph by aggregating all the sub-graphs found in each
1685 read_cgraph_and_symbols (unsigned nfiles, const char **fnames)
1687 unsigned int i, last_file_ix;
1689 struct cgraph_node *node;
1691 lto_stats.num_input_files = nfiles;
1693 timevar_push (TV_IPA_LTO_DECL_IO);
1695 /* Set the hooks so that all of the ipa passes can read in their data. */
1696 all_file_decl_data = GGC_CNEWVEC (struct lto_file_decl_data *, nfiles + 1);
1697 lto_set_in_hooks (all_file_decl_data, get_section_data, free_section_data);
1699 /* Read the resolution file. */
1701 if (resolution_file_name)
1704 unsigned num_objects;
1706 resolution = fopen (resolution_file_name, "r");
1707 if (resolution == NULL)
1708 fatal_error ("could not open symbol resolution file: %s",
1711 t = fscanf (resolution, "%u", &num_objects);
1712 gcc_assert (t == 1);
1714 /* True, since the plugin splits the archives. */
1715 gcc_assert (num_objects == nfiles);
1719 fprintf (stderr, "Reading object files:");
1721 /* Read all of the object files specified on the command line. */
1722 for (i = 0, last_file_ix = 0; i < nfiles; ++i)
1724 struct lto_file_decl_data *file_data = NULL;
1727 fprintf (stderr, " %s", fnames[i]);
1731 current_lto_file = lto_obj_file_open (fnames[i], false);
1732 if (!current_lto_file)
1735 file_data = lto_file_read (current_lto_file, resolution);
1739 all_file_decl_data[last_file_ix++] = file_data;
1741 lto_obj_file_close (current_lto_file);
1742 current_lto_file = NULL;
1746 if (resolution_file_name)
1747 fclose (resolution);
1749 all_file_decl_data[last_file_ix] = NULL;
1751 /* Set the hooks so that all of the ipa passes can read in their data. */
1752 lto_set_in_hooks (all_file_decl_data, get_section_data, free_section_data);
1754 timevar_pop (TV_IPA_LTO_DECL_IO);
1757 fprintf (stderr, "\nReading the callgraph\n");
1759 timevar_push (TV_IPA_LTO_CGRAPH_IO);
1760 /* Read the callgraph. */
1762 timevar_pop (TV_IPA_LTO_CGRAPH_IO);
1765 fprintf (stderr, "Merging declarations\n");
1767 timevar_push (TV_IPA_LTO_DECL_MERGE);
1768 /* Merge global decls. */
1769 lto_symtab_merge_decls ();
1771 /* Fixup all decls and types and free the type hash tables. */
1772 lto_fixup_decls (all_file_decl_data);
1773 free_gimple_type_tables ();
1776 timevar_pop (TV_IPA_LTO_DECL_MERGE);
1777 /* Each pass will set the appropriate timer. */
1780 fprintf (stderr, "Reading summaries\n");
1782 /* Read the IPA summary data. */
1784 ipa_read_optimization_summaries ();
1786 ipa_read_summaries ();
1788 /* Finally merge the cgraph according to the decl merging decisions. */
1789 timevar_push (TV_IPA_LTO_CGRAPH_MERGE);
1790 lto_symtab_merge_cgraph_nodes ();
1794 for (node = cgraph_nodes; node; node = node->next)
1796 /* FIXME: ipa_transforms_to_apply holds list of passes that have optimization
1797 summaries computed and needs to apply changes. At the moment WHOPR only
1798 supports inlining, so we can push it here by hand. In future we need to stream
1799 this field into ltrans compilation. */
1801 VEC_safe_push (ipa_opt_pass, heap,
1802 node->ipa_transforms_to_apply,
1803 (ipa_opt_pass)&pass_ipa_inline);
1805 timevar_pop (TV_IPA_LTO_CGRAPH_MERGE);
1807 timevar_push (TV_IPA_LTO_DECL_INIT_IO);
1809 /* FIXME lto. This loop needs to be changed to use the pass manager to
1810 call the ipa passes directly. */
1812 for (i = 0; i < last_file_ix; i++)
1814 struct lto_file_decl_data *file_data = all_file_decl_data [i];
1815 lto_materialize_constructors_and_inits (file_data);
1818 /* Indicate that the cgraph is built and ready. */
1819 cgraph_function_flags_ready = true;
1821 timevar_pop (TV_IPA_LTO_DECL_INIT_IO);
1822 ggc_free (all_file_decl_data);
1823 all_file_decl_data = NULL;
1827 /* Materialize all the bodies for all the nodes in the callgraph. */
1830 materialize_cgraph (void)
1833 struct cgraph_node *node;
1835 timevar_id_t lto_timer;
1839 flag_wpa ? "Materializing decls:" : "Reading function bodies:");
1842 /* Now that we have input the cgraph, we need to clear all of the aux
1843 nodes and read the functions if we are not running in WPA mode. */
1844 timevar_push (TV_IPA_LTO_GIMPLE_IO);
1846 for (node = cgraph_nodes; node; node = node->next)
1848 /* Some cgraph nodes get created on the fly, and they don't need
1849 to be materialized. For instance, nodes for nested functions
1850 where the parent function was not streamed out or builtin
1851 functions. Additionally, builtin functions should not be
1852 materialized and may, in fact, cause confusion because there
1853 may be a regular function in the file whose assembler name
1854 matches that of the function.
1855 See gcc.c-torture/execute/20030125-1.c and
1856 gcc.c-torture/execute/921215-1.c. */
1857 if (node->local.lto_file_data
1858 && !DECL_IS_BUILTIN (node->decl))
1860 announce_function (node->decl);
1861 lto_materialize_function (node);
1862 lto_stats.num_input_cgraph_nodes++;
1866 timevar_pop (TV_IPA_LTO_GIMPLE_IO);
1868 /* Start the appropriate timer depending on the mode that we are
1870 lto_timer = (flag_wpa) ? TV_WHOPR_WPA
1871 : (flag_ltrans) ? TV_WHOPR_LTRANS
1873 timevar_push (lto_timer);
1875 current_function_decl = NULL;
1878 /* Inform the middle end about the global variables we have seen. */
1879 for (i = 0; VEC_iterate (tree, lto_global_var_decls, i, decl); i++)
1880 rest_of_decl_compilation (decl, 1, 0);
1883 fprintf (stderr, "\n");
1885 timevar_pop (lto_timer);
1889 /* Perform whole program analysis (WPA) on the callgraph and write out the
1890 optimization plan. */
1893 do_whole_program_analysis (void)
1895 char **output_files;
1898 /* Note that since we are in WPA mode, materialize_cgraph will not
1899 actually read in all the function bodies. It only materializes
1900 the decls and cgraph nodes so that analysis can be performed. */
1901 materialize_cgraph ();
1903 /* Reading in the cgraph uses different timers, start timing WPA now. */
1904 timevar_push (TV_WHOPR_WPA);
1906 if (pre_ipa_mem_report)
1908 fprintf (stderr, "Memory consumption before IPA\n");
1909 dump_memory_report (false);
1912 cgraph_function_flags_ready = true;
1913 bitmap_obstack_initialize (NULL);
1914 ipa_register_cgraph_hooks ();
1915 cgraph_state = CGRAPH_STATE_IPA_SSA;
1917 execute_ipa_pass_list (all_regular_ipa_passes);
1920 bitmap_obstack_release (NULL);
1922 /* We are about to launch the final LTRANS phase, stop the WPA timer. */
1923 timevar_pop (TV_WHOPR_WPA);
1929 fprintf (stderr, "\nStreaming out");
1932 output_files = lto_wpa_write_files ();
1935 fprintf (stderr, "\n");
1937 if (post_ipa_mem_report)
1939 fprintf (stderr, "Memory consumption after IPA\n");
1940 dump_memory_report (false);
1943 /* Show the LTO report before launching LTRANS. */
1944 if (flag_lto_report)
1945 print_lto_report ();
1947 lto_execute_ltrans (output_files);
1949 for (i = 0; output_files[i]; ++i)
1951 if (output_files[i][0] != '*')
1952 lto_maybe_unlink (output_files[i]);
1954 free (output_files[i]);
1957 XDELETEVEC (output_files);
1961 /* Main entry point for the GIMPLE front end. This front end has
1962 three main personalities:
1964 - LTO (-flto). All the object files on the command line are
1965 loaded in memory and processed as a single translation unit.
1966 This is the traditional link-time optimization behavior.
1968 - WPA (-fwpa). Only the callgraph and summary information for
1969 files in the command file are loaded. A single callgraph
1970 (without function bodies) is instantiated for the whole set of
1971 files. IPA passes are only allowed to analyze the call graph
1972 and make transformation decisions. The callgraph is
1973 partitioned, each partition is written to a new object file
1974 together with the transformation decisions.
1976 - LTRANS (-fltrans). Similar to -flto but it prevents the IPA
1977 summary files from running again. Since WPA computed summary
1978 information and decided what transformations to apply, LTRANS
1979 simply applies them. */
1982 lto_main (int debug_p ATTRIBUTE_UNUSED)
1986 /* Read all the symbols and call graph from all the files in the
1988 read_cgraph_and_symbols (num_in_fnames, in_fnames);
1992 /* If WPA is enabled analyze the whole call graph and create an
1993 optimization plan. Otherwise, read in all the function
1994 bodies and continue with optimization. */
1996 do_whole_program_analysis ();
1999 materialize_cgraph ();
2001 /* Let the middle end know that we have read and merged all of
2005 /* FIXME lto, if the processes spawned by WPA fail, we miss
2006 the chance to print WPA's report, so WPA will call
2007 print_lto_report before launching LTRANS. If LTRANS was
2008 launched directly by the driver we would not need to do
2010 if (flag_lto_report)
2011 print_lto_report ();
2016 #include "gt-lto-lto.h"